The NIST TRC Ideal Gas Database provides information on the most important thermodynamic properties (heat capacities, entropies, enthalpies, Gibbs free energies and enthalpies and Gibbs free energies of formation) of organic and some other compounds in the ideal gas state. There is a total of more than 2000 compounds. The heat capacities are calculated using coefficients of linear or non-linear functions of their temperature dependence. These coefficients were obtained based on the results of statistical mechanical or group contribution calculations. calculations. New version of the database deploys Windows-based interface to ease its use.